Cutter



Jan. 27, 1931. R. w. M LEAN 7 1,790,106

CUTTER I Filed July 24, 1928 4 Sheets-Sheet 1 VIII/Ill IITZV/JBIZZOI v43225122 5 MaL m1/ Jan. 27, 1931. R. w. M LEAN 1,790,106

CUTTER Filed July 24, 1928 4 Sheets-Sheet 2 W11 filtfiii p iazz -a5.

Jan. 27, 1931; R. w. MCLEAN 1,790,106

CUTTER Filed July 24, 1928 4 Sheets-Sheet 5 Imp/272201": 1201249; WMC'Lfl n Jan. 27, 1931. R. w. MCLEAN 1,790,106

CUTTER Filed July 24. 1928 4 Sheets-Sheet 4 Babe .1 WML 18 M W fllfya'.

UNITE V Bonner 1w; Mann-AN, onnarnenwarna; Masses-artisans; Assienoa rocaevnn :cor: ron Gm'--coMrA1vY; erer, earnenwarn'ay raasssozresee rspxaco:1tr:enATIony or messAenuenrrs CUTTER V Applicatien filed July; 24,

' This invention relates to knives, cutters, or like devices and morepart cularly to knives- 01 cutters for HS6:1I1-.POW8I" driven machines.running at high speed and lI1;\VhiCl1 f 5- the knives or cutters aresubjected to hard and often: abusive treatment; necessitating theirfrequent replacement-.- W'hilel-theirnproved knife or cutter formingtheimmediate subject ofthe-presentinvention is of broad 3 utility, I haveherein chosen-to illustrate and describe it as embodied-in acottonseedhuller, \vh'ereizrits peculiarcharacteristics are high-- lyadvantageous;

A-=cottonseed-huller usually consistsot a 15 rotary drum" or cylindercarryin-g .knives space-d circumterentially about its periphery, whichare adapted to cooperate with similar knives mounted in one or moreconcave inembers arranged adjacent to the drum, such as is shoWn'in'm-yprior Patent No. 1,590,3O5 -issued June 29, 1926; the-seedsto becrushedor: hulled. being fed between the drum or cylinder and the stationaryconcave members and being suhj eeted to the crushing-orcuttingaction-ofthe-two sets of knives. 7 Machines of this character,and particularly the cutting elements thereof; are -or dinari lysubjected-toheavy shocks andsevere usa em Conseuenth the-knives uicklvbe 3O comedulled andare often brokenw Frequently metal-parts find theirWay intozthe machine and destroy one or more of the cut--v tingelementsbefore the'y cairbe eiefctedon removed,=as-idescribed in myabove-identifies prioripatent;

and then have received suitable hardening and sharpening treatments. Duetothe comparatively heavy loads andsho cks to which cutting elementsofthis character, are posed, they are made comparatively heavy (forexample-{ ofan inch-thicirl, andthey; are-accordingly expensive anddiiiicult" to d5 manufacture, and the necessityoffrequent renewal orreplacementof these compara-l tiilelyg expensive knives addsveryjsubsta'ntially to. :the operating expensesof machinesof thisgeneral character-.- a

lathe:prefer'iecbe-inbodinient of this invent:

D0 tie-n," thecuttingel ements comprise strips of 1928;; seriaino.295,044;

sheet lllBtal-WhlOh haveQma-rgin'al port-ions extending slightly, beyondthe edges of sup porting platesy the narrowwidth of the an? a supportededges permitting them satisfac torily towith'stand theshocks to whichthey aresubjectedw Due to the thin'ness ofthe e1.-

fective\cuttingfedge-thus provided, the hulls otthe seeds are out orbroken 'much'more 1 eflfectively, event after the blade has wornsomewhat than is the case with'tlielo'rdm ry blades which have acomparatively thick eut ting edge. 'As the thick blades earytheir jcorners are rounded away upon a relatively large radius, and thusfthecottonseeds engage the-"(same :with a- Wedging action and are" crushed,1 rather than having their shells cracked or cleanly severed} On theother hand, thethin bladecan neverwear to a'n.--edge of largelradius,and cracksjor cuts, rather. than crushes,no matter how badly it maybeWorn.v lnrthe former case a largejporti'onof the oil (When'thethick'b'lad es are very dull,

. as muchas 60%) is absorbedinto the shells and theefiic ency of the oilremoving process is therebygreatlyrediieed. Thua'the presentinventionnotbnly provides bladesivhichare' originally comparativelyinexpensive and 7 which may be reversible to provide inter'-' changeablecutting edges, but alsoprovides cutting elements Which are 'rnuch'moresatis- I factory and eflicient than usual blades for the intendedpurposes:

According to. the present invention the knives or cuttingelements"properare formed Heretofore knives for this purpose have generally been castor forged,

of metal strips whicharedighte'r andiconsequently aremore'easily'jvorked; and-are IIlllCll less expensive thanjthe"conventional knives;

- tonseed hullersor the liker-= In order-to retain the edges of theseblades in position; IproVide blades supporting plates -Whiclr cooperatetherewith and-Whichordinarily do not have a to be renewed "during thelife of 'thi'e machine.

Thus,- the blade's theinselvesmay be formed 7 of light metal strips,"for 'example' "of 1 sheet metal, which'inay b'e-rolledout in the form ofelongate-strips of the desired cross-sectional dimensionsand merely-;cut oilto the desired v lengths to provide the finishedblades; 1 Eitherbeforeyduri-ng-xor after the cutting operation,

suitable means forinteriitting with the blade supports be made byappropriate punching or rolling operations, and the appropriate heattreating and hardening operations may be performed. I V V The metalstrips thus employed have a'cost which is but a fraction of that of'theknives that were previously used, but their dimensions are whollyinadequate, unless supported, to permit them to withstand withoutbending,

he severe shocks or usageto which cutting elements of this character areordinarily subjected. Accordingly, the blade supports are to providesimple, cheap and effective knives. or cutters for cottonseed hullingand crushing machines and the like, such knives being applicable toexisting machines without modification of the latter and being adaptedto perform all the duties of the previously use: knives, but which costmuch less to manufacture; which perform the cutting operation moreeffectively and with less loss lof through absorption; to providesuitable methods and means for holding such knives 1n" the machines inwhich they are used while permit: ting the ready replacement orreversing of the knives; and in eneral to effect improvements inmachines or this character.

Fig. 1 is a vertical cross-sectional view of a cottonseed huller showingthe cylinder and portions of the concaves in end elevation;

Fig. 2 is a sectional detail of a portion of the cylinder and anadjoining part of a concave showing the arrangement of cuttingelementsin the same in accordance with the present invention;

Fig. 8 is an end blade support;

Fig. i is a fragmentary perspective detail of one type of blade; e

Fig. 5 is a fragmentary elevation of the support shown in Fig. 3;

Fig. .6 is a fragmentary elevational detail of another form of platesupport;

elevation of one form of Fig. 7 is a view showingv a fastening elementadapted to cooperate with the type of support shown in Fig. 5; j

Fig. 8 is a fragmentary perspective view of a type of blade which may beused in conjunc tionwith the support shown in Figs. 3 and 5; I Fig. 9 isa perspective view and sectional detail of another form of bladesupport;

Fig. 10 is a sectional detail showing the blade support ofFig. 6 and thefastening element of 'Z assembled to hold the blade in a retaining slot;

7 Figs. 11 and'12 are similar views showing oil holders suchas-illustrated in Figs. 5 and 9,

respectively a Fig. 13 is a section through a small portion of acylinder and an adjoining part of the concave illustrating other meansfor holding thecuttlng elements mounted therein;

Fig. l l is a similar view showing slightly different types of cuttingelements;

Fig. 15 is;a;.sectional detail of a portion of a cylinder showinganother type of cutter with the retainin means therefor 5 Figs. '16, 17,18 and 19 are similar views showing further variations of the invention;

Fig. 20 is a top viewof' a retaining nutand dog shown in Fig. 19.; I

Fig. 21 is "a perspective view of anend of another form of blade; 7

I Fig. 22' is a perspective view of an endof a support adapted toreceive the type of blade shown in Fig. 21"; a r I Fig. 23 is a similarview of a slightly differ ent form of support; and

Fig. 24 is a perspective view and sectional detail of one end of abladesupport particularly adapted for use with the blade of Fig. 4.

Referring to Fig. 1, the machine as a whole comprises a rotary cylinderor drum 1 mounta ed upon a shaft Zand provided with a series orcircumferential cutter elements 3. (looperating with the cylinder 1 1s aconcave,-here shown as made up of two parts 4 and 5, each part beingpivotally mounted adjacent to the bottom thereof, the part 4 beingpivoted at 6v and the part 7.. substantially as in my prior patent,above referred to. These parts may swing away from the drum 1 bybreaking one or more frangible links (not shown) in the event that anyhard substance, such as a stone or piece of metal, should get betweenthe teeth of cutting ed es, so that too great damage will be avoided, te resulting backward position of part 5 being shown in dotted lines. Theperipheral surface of the drum or cylinder 1 and the inner surfaces ofthe concaves are furnished with substantially radial blade receivingslots of the usual character and dimensions, which are adapted, ifdesired, to hold the usual thick and rigid, forged or cast blades orcutters of substantially rectangular transverse section. One side wallof the blade receiving slot constitutes an abutment element againstwhich the cutter is firmly held, as

hereafter more fully described Inasmuch as this entire construction andits operation is escribed in my prior patent, and as it enters into thisinvention'only as furnishing an appropriate environment for the use ofthe knives forming the main subject matter thereof, no furtherdescription thereof will be given here.

According to the present invention, as shown in Figs. 2, 12and 24, forexample, I

provide substantially radially disposed blade supports or plates 13preferably of substantially rectangulartran'sverse section andhavs ingsubstantially opposed grooves Hand 14 sameplane with the majorportionvof'the bladeJthe latter'having an intermediatebead 11fittingwithin the groove 1 otthesupporting plate 13, as shown in Fig.12. Preferablyv the groove 14 is arranged somewhat nearer the outer,beveled edge thereof, while the bead 11 upon the blade may be centrallylocated so that the'blade is reversible in relaan efiective cuttingedge.

tion to the blade support, i. e. after the edge designated 9 has-becomeworn or nicked, the blade and supporting plate may be removed from theretaining slot'and may be assembled in reverse relation so that the edge10 becomes lhe blade and blade supporting or holding plate are sodimensioned that when assembled they arecollectively of substantiallythe same size as the usual thick blade so that they are adapted to fitin and fill the slots in the cylinder and concaves ofexisting machines.The outer edge of the blade support preferably is slightly .beyond theouter portion of the drum wherebythe exposed portion of therear edge ofthe blade( as the same is moving during op eration of the machine) willbe somewhat greater than the exposed front edge which is reinforced bythe plate. The support 13 is accordingly provided with an outer edge 13incliningupwardly toward the blade. Furthermore, the elimination ofanacute angle or right angled recess at this point tends to prevent thepocketing or encrusting of cottonseed portions adjoining the blade whichwould eventually lessen the efi'ectiveness of amel rdjoining the bladereceiving slots are the usual recesses which receivethe heads 15 ofretainingscrews 30. Each screw head 15 is preferably provided with anannular flange 16 that is adapted to fitin the recess 17 of thesupporting plate 13, thus holding the plate andblade firmly in place. inretaining slot. When the blade 8 and the plate 13 are to be assembled inthe machine, the blade and support are first brought into interfittingengagement with each other and have their juxtaposed lower edgesinserted in jthe upper portion of the receiving slot. The screw 30 maythen be threaded part way into place, so that the flange 16'and recets17 are brought into loose engagement with each otheryit be mg understoodthat a plurality of these screws are similarly arranged along eachof theslots; The screws'may th n be tightened,

bri the blades and blade supportsdownwe rdl-y into firm engagement withthe bottonr-of-the retaining slot; The ends ofth' laden and/or thesupportingplates may other due-to the clamping action of Figs- 3, 6 and11 show aslightly different 7 form of the invention WAGIGiIl thesupporting d ybe of the same general type as te 26 n the groo s 1 1- forinterfittitng with the blades are omitted, and projecting hubs or pins27 are substituted. The blade 23 (Flg. 8)

descri ad, with the exception that.

which is adaped cooperate withthe supt port '26, i suitable openings 24;(one of which is shown) to engage these pins and to cooperate therewithin providing the internting-engagement of the blade and support.

Fig. 11 illustrates a blade and support of this character held in placeby the same type of retaining means that isillustrated in 7 an 10illustrate slightly different Thesupport 19 in accordrm of the inventionis proupper edge, while the retai'ningscrew 21 is provided with a headof inverted frusto-coning-the supporting plates and ,ie recessesadjoining its l tornnthe recesses2O beingadapted'to with heads of thistype and to per- "lit thesame to press the plate support 19downwardlyand firmly against the blade.

9v shows another form-of blade support'which possesses pins for engagingthe blade similar to those shown in Fig. 3 and recesses for engagingthe, fasteningscrews. However, thistype of support is characterized byhavingthe recesses spaced so that the metal adjoining the pins is notweakened.

'Thus, Fig; 9 illustrates a plate characterized by alignedspaced grooves126 upon one face of the plate andwith pins 25 projecting from the otherface of the same, these pins being inserted in portions of the supportwhich are between ends "of v adj oining' grooves.

Fig. 13 shows further adaptation of the inventionwherein two bladesupports 41 and are arranged at eitheriside, respectively,

of an intermediate blade 13. -Preferably one.

of; these supports 7 carries projecting elements such a pins lje, thatare adapted to eX- t-end through openings in the plate into rel ss inthe opposite supportj This type of cutter assembly may be secured lnplace by a any suitable retaining means, suchfas one of those previouslydescribe d,'*for example crews 30, such .as illustrated in and. de-

in connection with 12;

1g. 14 illustrates a form of the'invention wherein the blades andsupporting plates are secured to each other by suitable dowels or pins;so that this embodiment of'the invention quite closely resembles thatshown in Fig. 11.' In accordance with the embodiment of the'invention,thepins 2 Wmay'be arranged at one side of the mid-portion of thesupporting platdbeing adapted to engage suitable openings in the blade,the latter-being provideo with two sets of openings whichare arranged topermit the bladeto be readily reversible. 7

Fig. illustrates a further embodiment of the invention which differsfrom those previously described in. that the blade does not verti: alwall of this rabbet is provided with a suitable recess 62 which engagesrib 63 upon the blade 64. Thus the blade is clamped in place between theplate and the wall of the retaining slot and is heldin interlittingengagement with the former. if desired, the rib 63 and recess 62 maybeso positioned that this blade is readily reversible.

Fig. 16 illustrates aform of the invention which resembles that shown inFig. 15. i-Iowever, the supporting plate 60 of Fig. 16 has a rabbet 61with a recess 62 at the bottom of the vertical wall, this recessinterfitting with a suitable flange or rib'63 at the lower edge of theblade. The upper edge of the blade may likewise have a suitable flangeor rib 63 so that the plate and blade are very firmly interlocked witheach other. If desired, the ribs 63 'may have similar dimensions so thatthe blade is readily reversible. V i

Fig. 17 illustrates a form of the invention resembling those shown inFigs. 15 and 16 and utilizing a supporting plate 60 similar to thatillustrated in the latter figure, the blade 6- 1 fitting in a recess 6%of the character previously described.v In accordance with this form ofthe invention, the blade is pro- ;vided with marginal ribs or flanges63", these ribs projecting from opposite faces of the blade so that thelatter is more or less Z shaped. It is thus evident that when the ribsare similarly dimensioned that the blade may be reversible and that theouter rib may engage the peripheral surface of the holder in order toprovide additional supporting means forthe blade edge.

Fig. 18 illustrates a furtheruvariation of the invention wherein theblade may have a width substantially equal to that of-the support. Forexample, the blade may-fhave enlarged cutting edges 71-connected by athinner web 72. The supporting plate'in this form of the inventioncomprises a bar 74v which is arranged beneath the loweredge of thecutter 70. p thin intermediate web 72 provides suitableirecessesateither s1de of the blade that are adapted to be engaged by the heads ofthe retaining-screws 30, so that the lower portion of the "blademay heldfirmlyup-onthe supporting plateor bar.

' Since this plate is symmetrical, it may be readilyreversed, and thusprovidetwo cuttzngcdges. I x Y -19 illns r tcs a form ofblade and supm Iu POI/6111?, plate assembly similar to that shown infgig. 18, w'tli theexception that the relative dimensions oif the partsare varied, the

blade 2'0 having a comparatively shallow depth and the recessesprovidedby the, thin ner intermediate portion72 between the'cut} ti 5;portions '71 accordingly being reduced in height whilethesupportingplate 74: may be considerably deeper than t-he similarelement shown in Fig. 18. VVhile'the blades of Figs. 18 and 19. do notpossess all of the advantages of some ofthe other forms shown,

about an upwardly extending cup-like portion At one side of the dog theflange 81 is continuedin an upwardly and outwardly extending lug orprojection 84, the end of which is positioned and dimensionedto engagewithin one of the recesses at the side of the blade 70". screw 87 isreceived within the cup-like portion or" the dog 82 and when tightenedupon the same serves to press the projection 84' into firm engagementwith the longitudinal recess in the blade.

Figs. 21 and 22 illustrate a blade and supporting plate which may becharacterized by a plurality of openings 90 in the former, which areadapted to receive pins 91 in the latter, these pins and openings beingarranged adjacent the edges of the respective elements rather than attheir intermediate portions, while Fig. 23 illustrates 'a' further formof supporting plate wherein projecting pins 92 are arranged adjacent toboth edges of the supporting plate.

I claim: f

' 1. In a. machine of the class described having a curved holderprovided with a plurality of substantially radial blade receiving slotsofthe shape and dimensions usually provided for usewith thick and rigidforged blades, a supporting plate and a blade located in each slot, eachblade and its associated plate having complemental interengagingelements.

2. In a machine of the class described having a curved holder providedwith a plural- A suitable square-headed cooperating ity of substantiallyradial slots of substana tially rectangular 'transversesection adaptedto receive" the thick and rigid blades usually. employed, a supportingplate and blad5e' located in each slotponeof said latter parts" having areces'siand the 'otherofsaid parts,

having a .proj'ection engag said recess;

AAM

:31 In a machine of theclass described having a holder providedwith apluralitjofr slots each of substantially rectangular trans- A versesection,-a blade and at least-one sup-' comprising apart engageableWrtlrgnudaeporting plate in eachsloa' and fastening means adjoining eachslot, at leastone plate assoc1atedf'wlth each blade having aireee'ss inone of ltSWlClQf faces, and the fastening means cess, v a A, Ina machineof the class described havf inga holderprovided with a plurality ofslots substantially rectangular in transverse section, and a supportingplate and blade in each slot, the plate and its associated blade havingcomplemental interfitting elements, said supporting plate and blade'being arranged sothat the: latter hasa narrow margin projecting beyondthe edge Of'lJlIQfOIDIGI';

said supporting plate projectingbeyondsaid holder along onejside of the;bladef'a f'dis tance sufficient substantially tofill the angw .9

i I the blade and the holder.

lar space i eluded-between the outeriedgeof 5, In amachi'ne of the classdescribed having a holder provided fwith aplurality of slotssubstantially rectangular "in trans- Verse section, a supporting plate"and i a single thin sheet "metal blade in each slot,"the.plate and;blade, having interfitting engagement with each: other, said supportingplate and blade being arranged so-ztha't the latter has.

a narrow margin projectingfbeyond the edge e of the former, the outeredge of the plate be ing, bevelled inclined outwardly toward the regionof engagement with theblade, ivliereby the collecting of material in theangle be tween the] projecting blade portion and the plate edge isavoided. v r v "6Q A cutter for use'iin cottonseed hullers of the kindemploying a blade holder having 7 supporting plate and a bladej theplate and blade having interfitting. elements, said elements beingarranged so that a margin of the blade extends beyond-the edge ofthefplate, the oppositeedge of-the blade and' plate being substantiallyaligned, said interfitting 'elementsbeingffarranged so that the blade" my 7 be reversed relation {to the platewhe'reby eithercutti'ng edge may-pro'- jectbeyond the plate edgeand the other'cutr tingiedgemay beprotectedfby the corres V ponding plate edge." M 1 r I Sal cutter'fo'ruse in cottonseed hullers comprising a supporting plateand ablade',said blade and" plate having interfitting ele nientsfsaid elements beingarranged so that y g a; margin of the bladeexte'iids beyond theedge'ofthe plate,,the opposite-edge ofthe' bladebeing arranged sothatitdoes not'fpr'o 'ject beyond the edge of the plate, saidinterfitting elements beingarranged 'so' that the blade may be reversedin-relation to the plate, whereby? either" cutting edge nlay .proj ectbeyond theplate edge and the'othercutting edge may be pro-tected- 'by'the corresponding plate edge. -v 1 1 v v Ina cottonseed rhullerz havinga blade holder provided With a slot adapted fto'j hold the usual rigidand. thick forged blade: of.

substantially rectangular transverse section, the combination with-asheetmeta'l blade having a longitudinal cutting edge, the bladebeingsubstantially straight in 1 direction 9 transversely 0113' it scuttingedge, of one vvall, v of the slot constituting a rear support for Isaidblada'a removableasupporting platey" 7 and means for holding theblade and plate in I I asseinbledrelation within the slot. I

' 10; A cutter for lise in a holder having an elongate blade receivingslot oisubstantially rectangular transverse section, one Wall: of:

which constitutesan abutment element, said p cutter comprising sheetmetal blade adapted to be received inthe'fslot in the holder With oneside engaging said abutment element,v and an elongate clamping plate ofsubstantially rectangular tra 'nsverse section, v engaging theoppositeside oft-he bladti to position and strengthen the la'tteijlsaidblade and plate 7 when assembledsubstantiallyifilling said slot,

said blade beingsubstantiallystraight in-a direetion, transversely ofits cutting edge;

11.; In a cottonseedhuller, the combination With 1 a thin sheet metalblade which is sub st'antially straight in a direction transversely ofits cutting edge, of a holder having'an glen-,2 gate slot ofsubstantially rectangular tra.ns-'

verse section and of a Width adapted to hold a tliiclran'cl rigid blade,and means for-detach-v ably holding said thinblade "firmly in placewithincfthe slot. 12. In a cottonseed huller, the-combination Ivvith athin sheet metal-blade which is subv stantially fiat andstraight betweenitscutting edge the opposite/rear edge thereof, of a holder'comprisingamember having an elongate slot therein "of a Widthadaptedto hold athick'andf rigid blade of substantially rectangular transverse section;a plate adapt ed; to be recelved'in said slot together with said thinblade andtoimpartrigidityto the blade edge, and wedge means for holdingthe blade and the plate ri'gidly'within said slot.

13. In a cottonseed h uller', the bombina tion. with a sheet, metalblade, of [a holder comprising a member having an elongate 7 slottherein of. greater width; than the thickness of theblade, a plateadapted to be re ceived in said slot with the blade, the blade and platebeing provided with ahole and blade receiving slot adapt ed tO; receivea? g thick and r1g1;d vblacl'e fof suliistantially recftangulartransversesect on, one wall of said slot constituting an abutmentelement, said cutter comprising a thin sheet metal blade adapted to bereceived .inther slot in the I: holder with one side engaging saidabutment-' element, the opposite surfaces-of the blade beingsubstantially straight from the effec tive cutting edge to therea-r edgethereof,

and a plate adapted to be received inv said slot with the blade, saidplate reinforcing the blade and enabling it to perform its cuttingoperation without bending.

15.111 a cottonseed huller. the combina- 1 tion with athin sheet'm etalblade ofafholder I comprising a relatively 'tixed'member havinganelongate slot adapted to're'ceive, a blade of substantially rectangulartransverse sectionandoof greater thickness than said. sheet'metalblade,a plate adapted to be 'recei'ved in said slot with the blade, a recessin sa1dplate,and a; screw for detachably holding]- the parts to ethersaid screw havin a head 7 V v provided with a portion which-1s receivedin said recess. 1

16. In a cottonseed huller,'the combination l with a-sheet metal bladeof a'holder compris- 7 ing a member having an elongate slot therein ofgreater width than the thickness of the blade, a plate adapted to bereceived in said slotwith the blade, the blade and the plate of theblade, a plate adapted to be received, in said slot with the blade, theblade and the plate being respectively provided with a hole and a pinfor relatively positioning them being provided with a-recess: and acomplemental projection respectively for position- I ing themrelativelyto'each other, and means, for holding the blade and the platedetachably within said groove.

1 7. In a cottonseed huller, the combination with a sheet metal blade ofa holder comprising a member having an elongate slot therein of greaterwidth than the thickness with either lateral edge otthe blade incuttingposition, the plate having a groove therein in the side away from theblade, and a n the cylinder.

part whichis receivablelin the last-"mentioned;

groove to clamp the blade and plate inthe sloti 18.V Ina cotton concaveand ahullerdrum, each'having sub stantially radial blade-holding'slotsof substantially rectangnlartransverse section, and filling meansdisposed in said slots for re-4 intorcing relatively thin, flexibleblades, the combination of thin sheet metal'blades' disposed intheblade-holding slots, the side faces of each blade being substantiallystraight and parallel to asingle plane which is also parallel tothedirection of the slot in which'the blade is disposed, the cutting edgeof this blade beingdis'posed in this plane,

the blade being so thin that wear or chipping does not appreciablybroaden the efi'ec tive cutting edge thereof, wherebythe tendency forworn or chipped blades to crush material passingthrough the hullerzisreduced. d 1 r V 19. o A blade for use in a cotton seed hullercomprising a huller dru'm'anda concave, each provided] withsubstantially radial blade-holding slots of substantially rec'-tangulalr transverse section, and filling means, disposed lneach slotfor reinforcing a rel'aja tively thin, flexible blade,-- said bladecomprising a body having side faces which are substantially, straightfrom that, margin of seed hu'ller comprising a1 the blade which has thecutting edge togthe.

opposite margin thereof sothat the body of;

the blade may be disposed within a blade-I holdingslot withvone face'i'n, aplane sub-l stantiallylparallel to the .direction of the slot andwith the cutting edgefof the blade, also disposediin this plane,saidblade also being so thin and flexible asto require the external.suppo t and reinforcement along its" cutting edge provided by thefillin-g'means 20. Ina cottonseed huller comprising a.

tially restangular transverse section and of. a width adapted toreceivea thick, rigid cutter blade of substantially[rectangulartransverse section,thefc'ombinationof a detachable cuttervdisposed ,'n the v comprising a thin, flexible sheet metal'blade havingparallel side faces which aresub stantially straight from that marginwhich has the cutting edge to the onposite'or rear margin of the blade,so thatthefmargin havej ing the cutting edge and the opposite rearmarginof the blade may lie entirely betweenthe planes defined by theopposite side walls of the slot, and a'relatively thick and rigidsupporting p1ate,;said plate-and blade being adapted collectively tobereceived in the slot Signed by, me at Boston, .Mas'sachusett-s this20th day of July, 1928.

ROBERT McLEAN.

Slot, the cutter cylinder provided with a, slot' of: substan 1 iit I

